This study used a subsample of participants from a nationally representative longitudinal study of adolescents. Daily-diary approaches were used across 29 days in April of 2020, and May to June of 2020, to capture adolescents’ daily stress, coping, parental support, and affect at the onset of the COVID-19 pandemic. The final subsample included over 500 adolescents aged from 13 to 18 from 38 states in the United States, with a mean age of 15.0. Within the sample, 40% were male; 43% were Black, 37% White, 10% Latinx, 8% Asian American, and 3% were Native American; 61% came from a low-income family. This subsample differed geographically from the nationally representative sample, in that there were more participants from the Northeast (50%) and South (25%) regions [vs. Midwest (15%) and West (10%)] as compared to the original longitudinal study sample, due to these states implementing state-wide stay-at-home orders during the COVID-19 pandemic prior to the study's recruitment deadline.